Coming into the room, I found them ______ at the table, _____ chess.
As days go on, I think that Beijing will become ______ the whole world pay close attention to.
Although the old lady has a daughter and two sons ,______ live with her.
---- How long do you suppose it is ________he arrived here? -----No more than half a week.
The second half of his voyage was __________ dangerous part, during which he sailed round the Cape Horn.
----How long can I keep the book? ----A week.You _____to return it by Monday.